Before he became a playwright, Carlyle Brown spent 20 years as a sailor, with a specialty in 19th-century sailing. He called on that experience for his newest play, “Finding Fish,” which has its regional premiere this weekend at the Illusion Theater. The play is set in the future when the ocean’s fish stock has been depleted. But one Maine fisherman seems to know where the fish are. Noel Raymond, who recently staged a gripping production of Michael Elyanow’s “The Children” at Pillsbury House Theatre, directs this production featuring Jennifer Blagen, Paul de Cordova, Steve Hendrickson and Bill McCallum. (8 p.m. Thu.-Sat., 7 p.m. Sun. Ends Oct. 29. Illusion Theater, 528 Hennepin Av. S., Mpls. $25-$30. 612-339-4944 or illusiontheater.org).